PLEURONECTIN.4; ^83 



II. Pelvic fins asymmetrical : that of ocular side median, elongate, extending 

 forward to the urohyal, supported by a cartilaginous plate placed in 

 advance of the cleithra, well in advance of that of blind side, which (if 

 present) is small and short-based ; no pectoral radials, the rays inserted on 

 the hypercoracoid : dorsal fin extending forward on snout above nasal 

 organ of blind side, or commencing behind it ; parapophyses of prjEcaudal 

 vertebra; not united ; hypocoracoids narrowed forward below ; olfactory 

 lamins with or without a central rachis ; lateral line equally developed 

 on both sides of body ...... 5. Rhombosolei.v.^. 



I am unable to determine the systematic position of the following genus and species 

 from Chesapeake Bay. The eyes and colour are on the right side, but the pelvic 

 fins are said to be asymmetrical. It may belong to the subfamily Poecilopsettinae. 



NEOETROPUS. 



Neoctropus, Hildebrand and Schroeder, 1928, Bull. U.S. Bur. Fish., xliii (i), (1927), p. 174. 



NEOETROPUS MACROPS, Hildebrand and Schroeder. 



Neoetropus macrops, Hildebrand and Schroeder, 1928, torn. c:t., p. 174, fig. 89. 



The single known specimen (U.S. Nat. Mus. No. 87653) is only 55 mm. in total 

 length, and is from off Smith's Point, Va. 



Subfamily i. PLEURONECTIN^. 



Characters as given in the synopsis above. Twenty-seven genera from Arctic 

 and northern seas. 



Synopsis of the Genera. 

 1. Mouth large, maxillary on ocular side generally at least J head ; jaws and 

 dentition nearly equally developed on both sides ; vertebrae 40 to 62. 

 A. -Maxillary at least J head ; teeth sharply pointed or barbed. 



I. Vertebrae 49 to 62 ; dorsal 93-114, anal 71-89 ; body rather elongate ; 

 caudal peduncle slender ; caudal strong, lunate. 



a. Teeth mostly with barbed tips, some depressible, biserial in both 



jaws ; olfactory laminae arranged transversely to a central 

 rachis ; gill-rakers rather long and slender ; upper eye with 

 \ertical range ; lateral line without curve anteriorly ; vertebrse 

 49 to 53 . . . . . . . .1. Atheresthes. 



b. Teeth all pointed, none depressible, biserial or multiserial above, 



uniserial below ; olfactory laminae parallel, without rachis ; 

 gill-rakers short and stout. 

 II. Upper eye with vertical range, the interorbital space broader 

 than orbit ; lateral line without curve anteriorly ; 10 to 12 

 gill-rakers on lower part of anterior arch ; vertebrae 62 



2. Reinhardtius. 

 13. Upper eye lateral, the interorbital space not broader than orbit ; 

 lateral line with distinct curve above pectoral ; 7 or 8 

 gill-rakers on lower part of anterior arch ; \ertebrae 50 to 51 



3. HlPPOGLOSSUS. 



